Mix the strongest soap-lees with quicklime to the consistency of milk; let it lie on the stone, etc., for twenty-four hours; then clean it off, and wash with soap and water, and it will appear as new. The polish will require to be renewed by the process given above.

Another

Mix with a quarter pint of soap-lees half a gill of turpentine, sufficient pipeclay and bullock's gall to make the whole into a rather thick paste. Apply it to the marble with a soft brush; and after a day or two, when quite dry, rub it off with a soft rag. Apply this a second or third time till the marble is quite clean.